New End Mob Idea

My Idea For A New Mob In The End (end cities) Is A Trader that offers different items like, swords, shields, armour, blocks, potions, and has his work station in a end city structure, and he owns the shulkers, and is evil towards you, until you kill some shulkers. and another idea for him is, add missions/bounties you can do for him, and get rewarded with emeralds, diamonds, armour, tools, etc, or whatever,